Failed to send error message back to client for action – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to communicate back to the client after an action has been performed. This could be due to network issues, client-side errors, or server-side issues. To resolve this, you can try the following: 1) Check the network connection between the client and the server. 2) Verify if the client is capable of receiving messages. 3) Inspect the server logs to identify any server-side issues. 4) Ensure the action performed is valid and doesn’t cause any exceptions.

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This guide will help you check for common problems that cause the log ” Failed to send error message back to client for action [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: client.

Log Context

Log “Failed to send error message back to client for action [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    private static void sendErrorResponse(String actionName; TransportChannel transportChannel; Exception e) {
        try {
        } catch (Exception inner) {
            logger.warn(() -> new ParameterizedMessage("Failed to send error message back to client for action [{}]"; actionName); inner);

    private  void handleResponse(
        final long requestId;


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